Valve mechanism for internal-combustion engines.



Y W. STEAD. f'yApV'E EcHAMsM FOR INTERNAL comsusnou ENGINES.

APPLICATION FILED JUNE 21, I909.

Patented Aug. 3, 1915 2 SHEETS-SHEET I.

INIVEISITOR.

BY Q 1 v HI WITNES ES:

ATTORNEY IN FACT.

w. 'STEAD. VALVE MECHANISM ron INTERNAL consusflfou ENGINES. [APPLICATION FILED, mi 2!. I909.

mums-4M2; z;

Patfillted Aug. 3, 1915.

mvsuron gm ms ATTORNEY IN FACT ,JFQIUTED STATES EPATEivT OFFICE,

WILLIAM srnan; or nnlvcnnsrnn, ENGLAND, nssxenon, BY MESNE nssrenmnn'rs, so was COLONIAL gmrs'r conrnnv, rnus'rnn, or PITTSBURGH, PENNSYLVANIA,

a eonromrron or? rnnnsynvnlvra.

- VALVE MEQHANI SM FOB INTERNAL-COMBUSTION ENGINES.

aiaaioee.

To an whome't mag concern." Y

Be it known that I, Wnmmm: STEAD, a

1 subject of the King of Great Britain, and a president of Manchester, England, have made ,ii'fnew and useful Invention inValve Mechapis'm for Internal-Combustion Engines, of izvhich the following is a specification.

This invention relates to internal combustion engines of the kind in which the proper tions of the mixture of gas and air supplied to the cylinder after being adjusted in accordance with the nature of the gas or other conditions are maintained constant during the operation of the engine'the'amount of the mixture admitted to the; cylinder being varied by the governor in accordance with theload; a The object of the invention is to provide an improved device for regulat' g the proportions and amount of the combustible mix-- ture oi gas and air supplied to the admission.-

v alve or valves in engines of this type in hiscordance with the load. p

According to my invention I provide separate gas and air valves, preferably of the balanced puppet type, the valve stems be 'in'g connected to a pivoted lever which 1s operated by means oi a governor of'any sult- 'able type connected by a linkage with the pivoted lever in such a manner as to vary ,{its position and thereby the amount of the 0' ening of the valves in accordance with t e load. In order to adjust the proportions of gas and air in the mixture admitted, I provide means for varying the position of the fulcrum of the pivoted lever so that the relativeliit'ts of the valves may be-altered to obtain the best mixture under given conditions. V y

lnorder that the invention may be clearly ,understood 1 will proceed to describe the hams with reference to the accompanying drawings in which;

I Figure 1 is a sectional view on thebrol ren line 1-1 of Fig. 2, loolnng 1n the directlon of the arrow, and illustrates one form of a valve mechanism arranged in accordance with my inventlon- F1g.. 2 1s a view partially inelevati'on and partlally 1n section Specification of Letters Patent.

Patented Aug. 3, 1915.

Application filed llune 21, 1909. Serial No.- 503,507.

on the line e 2 of Fig. 1, looking in the direction of the arrow, the valve being shown in elevation; Fig. 3 is a sectional plan view on the broken line 33' of Fig. 2 and illustrates the arrangement of the gas inlet and outlet ports and the air inlet and outlet ports. Fig. 4 is a sectional view on the line 4-4 of Fig. 2. Fig. 5 is a sectional view on the line 5'5 of'Fig. 3.

Referring now to the drawings, in the illustrated embodiment of my invention an a1r valve 6 and a gas valve 7 are shown located in a single casing 8, which is divided mto gas and air receiving and delivering chambers by means of suitably arranged partitions-and diaphragms. An approxlmately Z-shaped vertical partition 9, clearly shown in Fig. 4, divides the interior of the casing into'two separate compartments one 'of'which receives and delivers air tothe enport 15, which communicates with the en:

gine cylinders through suitable piping. Diaphragms or horizontal partitions 16 and 16,

in con unction with a short vertical partition, divide the gas compartment of the casing 8 into a gas receiving chamber 17 and gas delivering chambers 18 and 18', which are respectively located above and belowthe formed withinithe casing. -The' chamber 17 communicates with a source of gas supply through an inlet port 20 and thepassage 19 is provided with a gas outletportfll'which communicates, through suitable piping, with the engine cylinders.

chamber 17 and which communicate with each other througha vertical passage 19l The air valve 6 is shown as a balanced puppet valve and seats against the diaphragms and 10' and controls the delivery of air from both the chambers 12 and 1 :2--to-the delivering chamber 11 and consequent-1y controls the delivery of air to the engine cylinders. The gas valve 7 is shown as balanced puppet valve and seats upon 7 spindle 33, the other end o the diaphragms 16 and 16 and controls the delivery of gas from the chamber 17 to both the chambers 18 and 18. This valve consequently controls the delivery of gas to the engine cylinders. gas through the casing are clearly shown Hi Fi s. 3, i and 5 by means of arrows.

he stems of the valves 6 and 7 are pivotally connected to theoppositeiendsyot a.

lever 2%, one end of which is connected by means of a rod 25 to one arm ot. the bell-' crank lever 26 pivoted at 27, the other arm of the bell-crank lever being connected to the operative member of a governor (not shown) by means of a link 28. Thegovernor may be of any well known type of gas engine governor so arranged that the operation of both the valves is automatically controlled by the governor and theamount of port opening is regulated inaccnrdance with the load. Q 7

A bracket 32 is secured to i casing 8 and supports one end of the w-threaded which is supported in a bearing 34 f( 1 "ed in a bracket which is also seoured ththe casing S. The spindle 33 is actuat'by means of bevel gearing 36 by a the rotation of whlch is effected by mea v of a hand wheel (not shown), and thc'rbd 38 is supported in a bearing #:0 formed in the bracket 35. Mount- --'e d-upon the threaded portion of the spindle the rod 25 so that the hand wheel may bereadily brought to the same point when the engine has attained normal speed.

It will be readily understood that the relative amounts of movement of the two valves (3 and 7, that is the throw of the valves may be varied by varying the position of the fulcrum of the lever 2st. With this arrangement, the quality of the mixtureof gas and air delivered to the engine cylinder can be varied by varying the position of the fulcrum of the lever 24. After the member 37 The currentsof air and.

has been so adjusted that the proper mixture 55 is insured, the amount that the valves 6 and 7 will open, is regulated by the governor, and the speed of the engine is controlled by varying the amount of the charge delivered; charge remains conment, the quality of the mixture admitted to the engine cylinder may be readily varied while the quantity of the mixture is analfected and is controlled by the governor as has been described. It will be apparent that the position of the fulcrum of the lever 24 may be varied without afiecting or in any way interfering with the operation of the engine to which the valves deliver gas and air. It will also be apparent that by providing balanced gas and air valves and by arranging these valves so that one is raised by the operating lever, while the other is lowered, the effort imposed upon the governor will be comparatively small and that the governor may be made very sensitive. In addition to this, my device is very simple and is not liable to get out of order and the use of puppet valves render it strong and re liable.

It will be understood that the invention is not limited to the particular arrangement for varying the position of the fulcrum of the valve operating lever and that various modifications in the construction may be made without departing from the spirit and scope of my invention.

Having now described my'invention, What I claim is:

1. A valve, comprising a casing provided with passages for delivering air and gas to engine cylinders, positively actuated balanced puppet valves for respectively controlling the delivery of fluid to the air and gas passages, a governor actuated lever pivotally connected at its ends to the stems of said valves so that one valve moves in one direction while the other valve moves in the opposite direction, and manually adjustable means for shifting the fulcrum of said lever to vary the throw of the valves.

2. In a device of the class described, a casing provided with an air-delivery chamher having an outlet, air-receiving chambers located above and below said air-delivery chamber, said receiving chambers having inlets and communicating with the delivery chamber, a gas-receiving chamber having an inlet, gas-delivery chambers located above and below said receiving chamber and communicating with the gas-receiving chamber and having an outlet for connection with In testimony whereof, I have hereunto the gas engine and valves for controlling the subscribed my name this eighth day of June, delivery of gas and air to said engine, said 1909.

valves being within the casing and control- WILLIAM STEAD. ling the delivery of fluid frointhe separate Witnesses: recelving chambers to the respective deliv- J. C. BoA'rFLoWnn,

ery chambers. N. H. SHEARD. 

